Analytical Solution to the Vortex-Excited Vibration of Tether in the Submerged Floating Tunnel

The concept of Submerged Floating Tunnel (SFT) can date back to the 19th century. Norway, Italy, Japan and some other countries have carried out the pertinence research over 30 years and SFT has obtained an increasing attention in recent years. There are some limits by our current research on tether structure which was an important member in SFT. In this paper, the author did some researches on the tether structure in the fluid condition and obtains some useful conclusions on the characteristic of tether structure under the influence of vortex-excited vibration. As results, this paper deduce an analytical equation on lock-in velocity under assumed computing model; Calculate the spectrum of lock-in velocity based on the geometric and physical characteristics of tether which has been selected ahead, then analyze the results and obtain the condition of vortex-excited vibration.